Hammond 1537M 250uH 5A High Current Ferrite Core RF Choke

The 1537M is a high current R.F. choke from the 1537 Series, specified at 250 uH with a tight +/-5% tolerance and a maximum DC current of 5 A. The part page describes it as an RF choke, heavy duty hash choke, suited to designers who need a leaded choke with a defined minimum Q.

Its minimum Q of 12 is the highest listed in the 1537 series. Other 1537 parts sharing the 5 A rating are the 1537H, which differ in inductance (40 uH). Its nearest inductance neighbours in the series are the 1537L below it (100 uH, 8 A) and the 1537N above it (500 uH, 3.2 A), so the 1537M fills the 250 uH step at 5 A.

Key electrical values for the 1537M: DC resistance of 0.114 ohms and a minimum Q of 12, with inductance tested at 1 kHz. The large ferrite core provides an extended saturation point, and the series lists an optimum frequency range of .01-2 MHz.

• Coil diameter: 0.69 in (18 mm)
• Core length: 1.25 in
• Leads: 1.5 in (+/- 0.1 in), 18 gauge lead diameter
• Operating temperature: -55 C to +135 C

The coil is covered with a vinyl insulation shrink sleeve. The part is RoHS and REACH compliant, ships at 0.05 lbs (0.02 kg), and carries UPC 623980299501 and UNSPSC 39121301.